Fix lint configuration and failures

Author: kevin-bates

.flake8

@@ -1,8 +1,10 @@
 import json
 from concurrent.futures import ThreadPoolExecutor
 
-import psutil
 from jupyter_server.base.handlers import APIHandler
+
+import psutil
+
 from tornado import web
 from tornado.concurrent import run_on_executor
 

jupyter_resource_usage/api.py

@@ -1,11 +1,12 @@
 from jupyter_server.utils import url_path_join
-from tornado import ioloop
 
 from jupyter_resource_usage.api import ApiHandler
 from jupyter_resource_usage.config import ResourceUseDisplay
 from jupyter_resource_usage.metrics import PSUtilMetricsLoader
 from jupyter_resource_usage.prometheus import PrometheusHandler
 
+from tornado import ioloop
+
 
 def load_jupyter_server_extension(server_app):
     """

jupyter_resource_usage/server_extension.py

@@ -1,4 +1,5 @@
 import six
+
 from traitlets import TraitType
 
 # copy-pasted from the master of Traitlets source

jupyter_resource_usage/utils.py

@@ -1,6 +1,19 @@
 [flake8]
 max-line-length=200
-exclude=jupyter-resource-usage/tests
+# Ignore style and complexity
+# E: style errors
+# W: style warnings
+# F401: module imported but unused
+# F811: redefinition of unused `name` from line `N`
+# F841: local variable assigned but never used
+ignore = E, C, W, F401, F403, F811, F841, E402, I100, I101, D400
+exclude =
+    jupyter-resource-usage/tests,
+    helm-chart,
+    hooks,
+    setup.py,
+    statuspage,
+    versioneer.py
 
 [metadata]
 name = jupyter-resource-usage